Any experience with Radiolink flight controllers?

Hi all

Just figured out the 9V BEC has died on a not overly old Speedybee v5 FC. Whilst looking for a new FC I've spotted Radiolink F405s and f722s in stock in the UK at suspiciously cheap prices, about a third the price of the T-Motor Velox I was about to order.

So anyone used one? For £16-18 I am tempted to take a punt.

Appreciate any feedback